Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6285decc9c6153…

MALICIOUS

PDF

124.7 KB Created: 2021-07-28 00:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d221bff566739ee04b7f8676eab745fa SHA-1: ee2ea8473537d0353d62e338ff174dcdc8bb3ba8 SHA-256: 8e6285decc9c61533dc9bc0df17a8fa28d7539e29ee38352106b906ed07b4b5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites and disposable domains. This suggests the document is designed as a link farm to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://svarovanijelinek.cz/ckfinder/userfiles/files/86001732168.pdf In PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/a0204b231e93fa83c26677c428f63c65/zokusutivavunerorawesiti.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07ba986deb---12079632481.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8n625foobugdo032oj5c47pa36/lusow.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a06efa3139a---gawigotipukajevapapowedug.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/40782007275.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/34276836354.pdfIn PDF document text
    • http://vinmexindia.com/uploads/93360322148.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e58a3fe6877---zuzoduzukixidi.pdfIn PDF document text
    • http://poorclarescork.ie/images/barajifatola.pdfIn PDF document text
    • http://arvikabc.com/images/uploadedimages/file/ravapapulomexadim.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dca637a7982---venezonetefidarekukinikil.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5g7oncq6dmhq4rlss4u0cci6up/5142499189.pdfIn PDF document text
    • https://papiratisk.cz/soubory/witekikuro.pdfIn PDF document text
    • http://bakoca.hu/files/file/vitopotoxopejexisuxaf.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/84393601940.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/90c027a05a20a3926b027fa09018291a/90692081942.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/basozujadem.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1ec694a5---jifikamaxurafe.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kiwumebunipasaf.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3304d8716e3fc9e2b5711049d62ec2f9/xinopofi.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/18bc0a5b5988072855bb387eb96234f4/zewena.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5d06d836a77329cb0a51746a353fd7c8/valafadiposonunuzinavipo.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/99718601524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=river+city+ransom+trophy+guidePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000176a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A3 17732 bytes
SHA-256: cd28200cef67d2c7f03b5dbcc756cb05f35284469a1c8a6522524afb8be7f65e
font_01_sfnt_off0001a4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4B4 3328 bytes
SHA-256: b6f8a652a8f9c5aa4e0e096d292ece55b0a4999e5de2fb196c2785b6dbd65641
font_02_sfnt_off0001b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B264 11240 bytes
SHA-256: 16738237733d64fd442004aa9200a635436d8d218f04c8736ff17890543a417f
font_03_sfnt_off0001cc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1